Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2013

Accounts Receivable [Abstract]

Schedule of Accounts Receivable

	December 31,
	2012			2013
Accounts receivable	$	23,804		$	54,743
Allowance for doubtful accounts		(213	)		(145	)
Accounts receivable, net	$	23,591		$	54,598

Movement of Allowance for Doubtful Accounts

	December 31,
	2011		2012			2013
Balance at beginning of year	$	14	$	68		$	213
Charge to expenses		51		154			157
Write offs during the year		-		(10	)		(229	)
Exchange rate differences		3		1			4
Balance at end of year	$	68	$	213		$	145